Flux-coupled tunable superconducting resonator

Li, Juliang, Barry, Pete, Cecil, Tom, Lisovenko, Marharyta, Yefremenko, Volodymyr, Wang, Gensheng, Kruhlov, Serhii, Karapetrov, Goran and Chang, Clarence 2024. Flux-coupled tunable superconducting resonator. Physical Review Applied 22 (1) , 014080. 10.1103/PhysRevApplied.22.014080 Item availability restricted.

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Abstract

We present a design and implementation of a frequency-tunable superconducting resonator. The resonance frequency tunability is achieved by flux-coupling a superconducting LC loop to a current-biased feedline; the resulting screening current leads to a change of the kinetic inductance and shift in the resonance frequency. The thin-film aluminum resonator consists of an interdigitated capacitor and thin line inductors forming a closed superconducting loop. The magnetic flux from the nearby niobium current feedline induces Meissner shielding currents in the resonator loop leading to a change in the kinetic part of the total inductance of the resonator. We demonstrate continuous frequency tuning within 160 MHz around the resonant frequency of 2.7 GHz. We show that: (1) frequency up-conversion is achieved when a kilohertz ac modulation signal is superimposed onto the dc bias resulting in sidebands to the resonator tone; (2) three-wave mixing is attained by parametrically pumping the nonlinear kinetic inductance using a strong rf pump signal in the feedline. The simple architecture is amenable to large-array multiplexing and on-chip integration with other circuit components. The concept could be applied in flux magnetometers, up-converters, and parametric amplifiers operating above 4 K when alternative high-critical-temperature material with high kinetic inductance is used.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Publisher:	American Physical Society
ISSN:	2331-7019
Date of First Compliant Deposit:	11 September 2024
Date of Acceptance:	24 June 2024
Last Modified:	08 Nov 2024 07:30
URI:	https://orca.cardiff.ac.uk/id/eprint/172027

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